So i was playing CS:GO and everything was alright but then all this sudden it takes me to my desktop. But it was still running on my taskbar and i clicked on it to re-open it and i got really bad fps, and I was lagging a ton,not usual. Games finishes my PC was really slow so i restart it and then it asks me to sign it which never happens since it auto signs me in. then i go to play csgo and it was uninstalled which i didnt do. I ran a quick-scan and it found nothing. what happened?